Air distribution system



Sept 22, 1953 Filed Oct. 28. 1949 N. R. EMERY ETAL AIR DISTRIBUTION SYSTEM 2 Sheets-Sheet l Sept. 22, 1953 N. R. EMERY ETAL AIR DISTRIBUTION SYSTEM 2 Sheets-Sheet 2 Filed Oct. 28, 1949 IN V EN T0125.

Patented Sept. 22, 1953 UNITED STATES ATENT OF FICE 2,652,763 Aiit tenements system Neville R. Emryai'id Preston 0. Roberts, Chicago, Ill., a'ssignors, by mesneas'signments, to

BurgessManning Company, 'Libertyville, 111:, a corporation of Illinois atheists meter 28, 1e'49, se'r"ie1-No. 12&,2t2 11 Claims. (01. Q's-it) jrhe presentinventio relat s to an improved en; er apparatus for the draft free distribu tron tr circulation of 'air, embodied for illustra ti've uipefses in a ventilating system for buses, fai y 'chs and related installations.

' oiis'trhction according to the invention involves, in operation, the principle of a dual eff air dduhle "ducts to arrqre velocity distributioh 6f the? to 'a space to be ventilated. In this regard th apparatus is generally similar to the underlying dual flew, double duct, velocity fdis'tribut'ion principle 0f the ventilating system illustrated and described in the copendi a! plicat'ion of John A. Marquardt, Serial No. 43,742, filed august 171, 1948 This involves the i fsfe of fiairof elongated, parallel, adjacent duets *e"t'end1nglengthwise 6i "and usual above the sp as to he ventilated. Said ducts are methansweet-mete iro'rn oneanother by a 'perio'ra'ted I 'l throu'gh whi'eh the air in one duct is a apted to issue into the ether. The duct ad} 59mins the "spec-e ts be serviced is separated therefrom by a perforated panel 'o r wall, to enable controlled issuance offair from that duct into the space. A blower or its equivalent sup- '15 es air uhder pressure to the "end of b oth ducts, sing a str amer 'air to new longitudinally er of id ducts.

cts which is remote from the space to be is? s sensed, t ea ies ether t e h rforate'd aiijpervio'us member referred to us 'e li ii' el bri i i a m t ic y o f d. transversely of the direction "f the air insaid other duct. This sets l p t ene ie lafitifith t or that '9 ins. is i l n a d d tu b the transverse jets is progressively and proporf t ew dir te in the, n thw e-s n e with e to the'diiection of flow, through the Pi 0 1. 41; it panel. rrw v ipin ne t e space to be ventilated, A uniformly distributed y of air at low velocity to the space to be yfentilatedis ass red, characterized by its cr ftii" ure and also by theco'nstancy or temt, 61 a e ma n ai d. .a t

'stated the present system operates on the se tii l fdo bl l w, vel y istr uii p ns i' aelqu t. th P sic e be t he s. f'i ientedf i s mi Structural refinements which have been found tomatern-11 increase the 'e'm'ciehey of the system, as well as its adaptability to various installations.

These refinements 'toiich on the control bf the nel di -like eohstruction of ai'r-pervious rnaistat on, these; sawing in that th for a v 2 ratio of air. volumes longitudinally traversing the respective ducts of the apparatus, the control of the iengthwise distribution of the turbulencecreatmg jets referred to above, and the control of the uniformity or ultimate issuance of the air to the space to be serviced. They also involve the improvement of the construction in a mechanical "sense, particularly with regard to the ease of adjusting the same for different installations and the ease and speed of cleaning and servicing the apparatus from time to time.

Thus it is a general object of the invention to provide a dual fi'ow, double duct, space ventilating "or air "circulating and distributing apparatus or system operating on the velocity distribution principle, in which improved means are provided to adjustablymeter or proportion the air streams longitudinally traversing the respective ducts of said system, and in which provisions are made to cohtrol said streams for their intended purpose by partially deflecting the same in a transverse direction, the last named provisions being at least partially adjustable in nature, whereby to adapt the system to satisfy varying conditions or factors eiristing or likely to exist in any given installation, for example, the length or height thereof, maximum blower output, etc., and to improve its reliability and flexibility 0f operation.

A further 'bject of the invention is to provide such a dual flow, double duct system which 'emcity's mechanical bathing provisions located in one or both of the ducts thereof to supplement and improve the inherent air bafiling characteristi'c thereof, certain of which provisions are preferably "adjustable for the purpose of improving the contrdl of the air streams traversing the respective ducts, 'in particular 'by insuring desired local control of air deflection at any point along the length of one diict an'd uniformity of distribution of air issuing from the other; with reference to the length of the installation.

More specifically, it is "an object of the invention to provide a ventilating apparatus or system of the sort referred to above, in which each of the lhngitli'din'ally extending ducts is provided with transverse baflle provisions; of which those in the duct remote from the space to be ventilated adjustably control the deflection of part of the air traversing the same toward and into the other duct, thus insuring that adequate air shall be so deflected at all zones along the duct length n accordance with the particma'r requirements of these zones, m meet to accomplish the desired jet creating function and; in turn; the

desired ventilation of the space in question; and in which the bafile provisions in the other duct insure uniformity of distribution, in any given zone, of the air emanating to said space to be ventilated.

Generally, it is an object of the invention to provide an improved ventilating or air distributing system which is characterized by improved adjustable proportioning means to meter the relative volumes of air entering and traversing a pair of parallel, elongated, distinct but intercommunicating ducts; by means to insure proper control of the deflection of air traversing one duct toward and into the other, so as to satisfy local or zonal requirements for the desired ultimate distribution along the duct length; and by means to accomplish the issuance of air from said other duct to a space to be ventilated in a low velocity, draft-free manner.

A further obiect is to provide various mechanical or structural improvements in a system of the foregoing type which facilitate and expedite the adjustment, cleaning and servicing of the same.

The foregoing statements are indicative in a general way of the nature of the invent on, but other and more specific objects will be apparent to those skilled in the art upon a full understanding of the construction and operation of the device.

A single embodiment of the invention is presented herein for purpose of illu tration, but it will be appreciated that the invention is susceptible of incorporation in other modified forms coming equally within the scope of the appended claims.

In the drawings,

Fig. l is a fra mentary perspective view of more or less diagrammatic nature, being partially broken away, illustrating the general arran ement and relationship of parts of an installation of the air circulatory system of the invent on. as ao lied in the ventilating of a standard railway coach;

Fi 2 is a fragmentary schematic view in side elevation further illustrating the relationship of the component arts of the system;

Fig. 3 is a fragmentary too plan view, partially broken away, of the ventilator construct on in the vehicular installation chosen for the purpose of illustration, being viewed from line 3-3 of Fig. 4;

Fig. 4 is a fragmentary view in central longitud nal, vertical section along the section line 5-4 of Fig. 3;

Figs. 5 and 6 are, respectively, views in transverse vertical section along lines corresponding to lines 55 and 56 of Fig. 3; and

Fig. '7 is a diagrammatic view in transverse vert cal cross section, illustrating the manner in which the ducts of the system are exposed for convenient cleaning, adjustment and servicing.

Referring to the drawings, the reference numeral IE3 generally designates a structure in which it is desired to install the ventilating or air circulatory system of the invention. This isrepresented for purpose of illustration, by a railway coach, the roof of which is designated by the reference numeral H. The roof may, in some installations, serve as the top imperforate wall of the duct structure of the invention, which structure is generally indicated by the reference numeral l2.

lustrated in Fig. 2 in their operating relationship to one another. These are, generally con sidered: an elongated, perforated bottom, outer duct I3; an inner, perforated duct l4 housed within the duct l3; a plurality of transverse, adjustable control bafliles 15 disposed in the outer duct above but in spaced relation to the inner duct; a plurality of fixed bafiies It disposed in the inner duct i4, terminating above the bottom of the latter; an adjustable metering or proportioning device I! located at the air entry side of the duct structure I2; and a transition or connecting unit l8 which extends between the proportioning device I! and the main body of the inner duct l4, serving to insure the separation of the air streams which traverse ducts l3, M as they pass this intermediate zone.

The duct structure I2 is associated in receiv ing relation to a fan or blower IQ of appropriate size to supply a desired volume of air at a desired pressure and velocity. If desired, an air conditioning unit 25 may be interposed between the blower is and duct structure, through which unit the air is forced prior to entry into said structure. A continuous recirculation of air to the blower from the space to be ventilated, i. e., the coach interior, or at least a portion of the air which is not externally exhausted, is accomplished by standard recirculatory and duct provisions, illustrated simply in the present installation by the recirculatory grill 2 l.

Referring to Figs. 3, 4, 5 and 6, in conjunction with Fig. 1 showing the general layout, the outer duct I3 includes parallel, imperforate, vertical side walls 23 which, in the illustrated embodiment, are shown as being connected at their upper margins by a top wall 24. This wall is insulated appropriately against heat transfer with relation to the roof ll of the coach to which the system is applied. Side walls 23 are likewise insulated properly in an actual installation. Duct I3 is preferably made up of a plurality of partial lengths or sections of sheet metal, which lengths are disposed in end-to-end relation, being almost, but not quite, in actual end-to-end engagement with one another.

As will be evident from an inspection of Figs. 5 and 6, the perforated bottom wall of the outer duct I3 is, in effect, constituted by the inner duct M, in the illustrated embodiment. This inner duct is defined by a pair of upwardly convergent, perforated side walls 25 which are integrally joined at their top margins by a horizontal, transversely extending, perforated panel 26. These walls and panel are uniformly perforated throughout 5% of their entire area by round holes of uniform size which are spaced uniformly. However, no attempt has been made to reproduce exactly in the drawings the size of the holes in any of the perforated walls, panels or bafiles of the system.

Said walls 25 and panel 26 thus provide a perforated bottom wall, generally of inverted V- shape, for the outer duct l3, which bottom wall is designated for convenience by the reference numeral 21. They at the same time serve as the top and side walls of the inner duct M. This last named duct is completed by the horizontal, transversely extending bottom wall or panel 28, exposed to the space to be ventilated, which is perforated to the extent of 10% of its entire area by small, uniformly spaced, round holes of uniform size. Vertical extensions 29 of the inner duct walls 25 connect the same to the bottom panel 28.

If desired, a rigid grill 30 presenting ample matc es area 10f :inlet :openings :may the rdi-sposed Qtranslversely or rtherinner duct :14 at the iforward, air entry :end ithereof, :for the purpose ;o'f?controlling aspiration of :the :air entering 'ztherinneri'duct from the rblower 1:9. This grill is marginally shaped in iconformity with the trapezoidal outlineio'f the inner duct unit,u illustratedfinii'igfi.

.The transition :unit I 8, :forwardly of said :air :entry .end for the duct :structure 12, :is provided with a forwardly and downwardly inclined, iperiterated bridging: panel 3:! connecting the :forward edge of :horizontal :inner duct :panel i216 with the air proportioning device 111. This device is looated just :below the vertical nnid :p'oint of the inner duct 14. inclined, forwardly and laterally a tapered, "perforated :side plates :32 lot triangular shape extend outwardly from the sides of panel 3] :and reanwardly to the ductfsid'e Walls :25. "They are, in effect, forward extensions of the inverted NI-shaped, outer "duct bottom wall :2?! and serve to 'theiinner and router :ducts 13, I4 :fiorwardly to the :propontioning device .117. They are periterated in zthe :same may as the duct wall 2 and perform the same jet creating function in the intermediate, transition zone as the wall 12:! per- 1 for-ms rearwardl of that zone.

.pmportioning device I 3! includes a forward- Ely extending, imperforate blade '36 which is suitably pivoted by a transversely extending, horizontal hinge pin 37 to the forward edge of the panel 31 By adjusting the blade 3 6 upwardly 'or downwardlygas indicated in solid and-dotted *lines .iniE'ig. 4, the ratio of the volumes of air entering the respective outer and inner ducts I3, 1 4 may .be varied as desired. This control feature is of importance in the initial adjustment of the system in accordance with the length thereof, the blower output, or other particular or variable factors.

The blade 36 may he provided with a -downturned "locking :ea-r 38 adapted to coact with circular-anchoring disk 39 which is fixedly mounted by a small angle bracket on the duct structure centrally of its sides. Disk -.iil is provided with a plurality of circumferentialiy "spaced holes 40 adapted to receive a screw and nut 41 for the purpose of -'clamping the ear '38 and blade 36 in a desired adjustment-f the latter.

Rearwardly of the air entry end or the duct structure 12 the outer duct is provided with a plurality of the above identified, longitudinally spaced control baffles l 5, the number and spacing thereof'being determined in accordance with the length of the installation. These 'ba'files are constituted by transversely disposed rectangularembodiment of the invention, the control baffies are shown in approximate vertical alignment with the zone 47 at which the duct sections of the inner duct M are adjacent one another in the lengthwise sense. The number of bafiies i5 is governed by the length of the installation and their purpose is to afiord a local or zonal control, with reference to the length of the system, of the amounts of air which are jetted through the outer duct bottom wall 21. Under certain circum- 6 stances it isdesirableito have amoreipronounced jetting action at'somezones :than at others.

We :find that the *operating characteristics of atheinstallation-are pronouncedly better with the bathe ;plates 44 disposed -in depending --relation -to the atop-of the upper duct -|-3,-as compared with other arrangements of theupper-duct baffles. In fact, =acceptably "successful operation of the sys- :iS attributable -in substantial degree to this particular disposition of control bafiie devices l'5.

The inner duct M isprovided with aplurality of the longitudinally spaced baffles 1-6, shown as being longitudinally staggered with relation to the 'baffles i=5. like :bafiies 5, the number of the 'bafiles i=6 dependsprimarily on the overall length of the installation. They are constituted by plates which are trapezoidal in: shape to correspond to the internal outline of ethe duct wall or paneling-21, and which are perforated to the ex- :ten-tof approximately 20% of their entire area. They :extend downwardly into the inner duct 14 only Epartially aof the vertical dimension of that duct and their purpose is to insure equal 'loo'al =cl-istribiition of the air which ultimately issues downwardly through the perforated bottom wall 28 of the inner duct.

operation, "air supplied by blower i=9, heated or cooled "by unit 20 if such conditioning is desired, is appropriately metered and directed to enter and traverse the inner and outer ducts 1'3, M, respectively, in desired proportion. The air directed respectively above and below the blade 36, panel 3l and side plates '32 flows along the upper or outer "duct 13 and the lower or inner duct H.

.A portion of the upper stream progressively passes through the perforations of the inverted V bottom wall 21 of the outer duct to enter the inner duct F4 a direction normal to the direction of new of air in said inner duct. This'ocours normally both in the main duct structure l2 and in the transition zone immediately forward "thereof. The adjustable perforated baffles 15 supplement in a positive manner this natural tendency of the flowing air to issue downwardly through the Wall paneling 27, without imposing an undue restriction to the now of air in the outer duct 13. In practice, these b'a'flies are preferably positioned so that throughout the length of the duct structure small air jets of uniform size and low velocity are caused to issue into the inner olhct transversely of the direction of air now therein. However, adjustment of the baffle plates 44 enables the jetting action to be intensified or lessened at certain zones with refer once to other zones in order to meet varying redu i'rements of different installations.

Thesejets act asair baffles, as described in the Marquardt application identified above, to agitate and create a degree of turbulence in the longitudinal flow of air in the inner duct 1 4. This turbulence in turn tends to cause the lower stream of flowing air to issue downwardly through the perforations in the bottom wall 28 of the inner duct into the adjoining space to be ventilated, the depending, fixed bafiles It in this duct to insure continuity and uniformity of distribution of air issuing from said bottom wall 28, in any iven zone.

The foregoing system is simple and economical in its parts and, following initial setting or adjustment thereof, is operative to produce a uni- .form, balanced distribution of air in a draft-free manner, and with reliable temperature control throughout a space to be ventilated. Following '7 initial installation, subsequent servicing or adjustments are rarely called for, if at all.

A further feature of the invention, illustrated schematically in Fig. 7, concerns the mounting of the duct elements to enable convenient and easy access to the interior of the duct structure I2 for adjustment, cleaning or servicing. To this end, the bottom wall or panel 28 of the inher duct i4 is hinged at '5!) to the lower margin of the left-hand side wall 23 of the outer duct i3, as particularly illustrated in Figs. 5 and 6 of the drawings. The wall paneling 2! of said outer duct is in turn hinged at 5! to the opposite right-hand margin of said inner duct bottom panel 28. The latter is maintained in operative horizontal position by any suitable releasable provisions, so that by releasing said provisions the bottom panel 28 and said duct wall paneling 2! may be successively pivoted about their respective hinges to drop the parts involved to the position illustrated in Fig. 7. The interior or the parts is then conveniently accessible to an attendant.

Those skilled in the art will perceive the possibility or desirability of further modifications or changes of the above described features, without departing from the principle of the invention. With this in mind, we desire that the invention be not limited in interpretaion beyond what is reasonably consistent with the appended claims.

We claim:

1. An air circulatory system comprising a pair of elongated ducts arranged in adjacent parallel relation to one another to extend along a space to which air is to be supplied, one of said ducts comprising a transversely disposed, airpervious element paralleling and communicating the same with the other duct, said other duct comprising a transversely disposed, airpervious panel paralleling and communicating the same with said space to be supplied, said panel defining a wall of the last named duct, a common air intake member to which the forward ends of said ducts open, a single source of air discharging to said common intake member and flowing longitudinally and unidirectionally through both of said ducts, said source, intake member and ducts being arranged in straight longitudinal alignment, a plurality of baffles in said first named duct spaced from one another longitudinally of the duct and disposed in transversely extending relation to said first named air-pervious element, said baffles acting to deflect air traversing the same toward and through said first named air-pervious element, whereby to agitate the air flowing in said other duct, said agitated air issuing from said other duct through said last named air-pervious panel to said space to be supplied, and a plurality of further bafiles in said other duct spaced longitudinally thereof and acting to equalize throughout the length of said system the distribution of air so issuing to said space.

2. An air circulatory system comprising a pair of elongated ducts arranged in adjacent parallel relation to one another to extend along a space to which air is to be supplied, one of said ducts comprising a transversely disposed, air-pervious element paralleling and communicating the same with the other duct, said other duct comprising a transversely disposed, air-pervious panel paralleling and communicating the same with said space to be supplied, said panel defining a wall of the last named duct, a common air intake member to which the forward ends of said ducts open, a single source of air discharging to said common intake member and flowing longitudinally and unidirectionally through both of said ducts, said source, intake member and ducts being arranged in straight longitudinal alignment, an adjustable proportioning device mounted adjacent the air entry end of said ducts to regulate the ratio of air volumes entering and traversing said respective ducts, a plurality of baflles in said first named duct spaced from one another longitudinally of the duct and disposed in transversely extending relation to said first named air-pervious element, said baffles acting to deflect air traversing the same toward and through said first named air-pervious element, whereby to agitate the air flowing in said other duct, said agitated air issuing from said other duct through said last named air-pervious panel to said space to be supplied, and a plurality of further baffles in said other duct spaced longitudinally thereof and acting to equalize throughout the length of said system the distribution of air so issuing to said space.

3. An air circulatory system comprising a, pair of elongated ducts arranged in adjacent parallel relation to one another to extend along a space to which air is to be supplied, one of said ducts comprising a transversely disposed, airpervious element paralleling and communicating the same with the other duct, said other duct comprising a transversely disposed, airpervious panel paralleling and communicating the same with said space to be supplied, said panel defining a wall of the last named duct, a common air intake member to which the forward ends of said ducts open, a single source 01 air discharging to said common intake member and flowing longitudinally and unidirectionally through both of said ducts, said source, intake member and ducts being arranged in straight longitudinal alignment, an adjustable proportioning device mounted adjacent and extending forwardly of the air entry end of said ducts in opposition to the direction of said flow, said device acting to regulate the ratio of air volumes entering and traversing said respective ducts, a plurality of bafiles in said first named duct spaced from one another longitudinally of the duct and disposed in transversely extending relation to said first named air-pervious element, said bafiles acting to deflect air traversing the same toward and through said first named air-pervious element, whereby to agitate the air flowing in said other duct, said agitated air issuing from said other duct through said last named air-pervious panel to said space to be supplied, and a plurality of further bafiles in said other duct spaced longitudinally thereof in longitudinally staggered relation to said first named bafiies and acting to equalize throughout the length of said system the distribution of air so issuing to said space.

4. An air circulatory system comprising a pair of elongated ducts arranged in adjacent parallel relation to one another to extend along a space to which air is to be supplied, one of said ducts comprising a transversely disposed, air-pervious element paralleling and communicating the same with the other duct, said other duct comprising a transversely disposed, air-pervious panel paralleling and communicating the same with said space to be supplied, said panel defining a wall of the last named duct, a common air intake member to which the forward ends "ofsaid ducts-open, a single'source of air' disacsaccsr ducts; said source; intake 7 member and: ducts be-'- ing arranged in straightlongitudinal alignment; an adjustable;- blade-Ilka proportion'ing device mounted" mediallyof said ducts to extend for wardly-of the air entryzendof the same ina-op position to the direction of said flow-and adapt ed to regulate theratio of' airvolumesenter ing" 'and traversing said-respective ducts; a pl ui ra'lity'of' longitudinally spaced baflles adiusta-bly mounted in said first'named' duct-intransversely extending relation' tosaid firstnamed air-pervir-rous element,- said baflles'actin'g to: deflectfiai'rr traversing" the same toward 1 and through said agit'ate the -air flow-ing in said other-' duct said; agitated air issuing-fromsaid: other ductdillrouglzl-rx saidlasten'amed 'air-perviou'spaner tor saidtspacea to be supplied, and a plurality of further baifiesz spaced longitudinally of one another in said other 'duct in transversely- "extending relation to said last named air-pervious panel, saidfurther" bafliesacting to equalize througlio'u-t' the length of said. systemthexdistributioni' of air so issuing. to. said space.

5 An, air circulatory system comprising .a, pair chargingwto said commonrintake memberlandflow-ing; longitudinally through, both of said ducts, said source, intake member and ducts being arranged in straight longitudinal alignment, an adjustable, blade-like proportioning device mounted medially of said ducts to extend forwardly of the air entry end of thesame in opposition to the direction of said flow and adapted to regulate the ratio of air volumes entering and traversing said respective ducts, a plurality of longitudinally spaced bafiles adjustably mounted in said first named duct in transversely extending relation to said first named air-pervious element, said baffles being air-pervious and acting to deflect air traversing the same toward and through said first named air-pervious element, whereby to agitate the air flowing in said other duct, said agitated air issuing from said other duct through said last named air-pervious panel to said space to be supplied, and a plurality of further air-pervious baffles spaced longitudinally of one another in said other duct in transversely extending relation to said last named air-pervious panel and in longitudinally staggered relation to said first named bailies, said further baflles acting to equalize throughout the length of said system the distribution of air so issuing to said space. Y

6. In an air distribution system, a single source of air, an elongated dual duct unit having a common forward intake duct portion connected to the discharge of said single air source, said unit including a side wall structure and a perforated panel extending transversely of said wall structure and adapted to be disposed adjacent a space to be supplied with air, a further perforated, transversely extending panel in said unit dividloii ing the same iinta parallels elongated; outer rand? inner ductsawhicha'commnnicate with; one another through: the last tnamed panel, said last named panels comprising i-l angular-1y related. perforated;

membersjointlyi ofiinverted iii-shape said ductsopening forwardly" to' said i. common intake duct portiorr' and said inners ductubein'g adapted to communicate through the first named panel with said space-to: bezsuppliedip and means to: force: air longitudinally'iandi simultaneously through: both or' saidiiductsg whereby to cause'i agitatio'mof the airlfio'wing iin said'iriner duct-byjets of air from said oufierzdu'clz issuingithroughi the inverted -V-'- shaped panelil 7-2: an airdistribution system, a singl'e-source: of-faiman elongated: dual: duct unith'avinga common forwardi intakeirduct 'portion connected to' the discharge oi said single K air: source; said: unit including a sidewall structure and a perforated panel extend ingwztransversely of'isaid wall structure-andi adapted to b-edisposed. adjacent a: space to be supplied with air; a further perforated,- transversely extending-panel. in said unit divid ing-thasame iintopara-lieL elongated, outer and inner ductswhich communicate with oneanotherthrough said last namedpanel, said ducts opening forwardly tasaid common intake ductportion and "said-inner-duct being adapted to communicate through said firstnamed panel with said spaceto-Joe supplied; and battlemeans-disposed in said respective ducts-in transversely extending rela'-'-=- tion-to said respective-panels todire'ct air travers ing theaduots toward said respective panels, the

bafiler. means iniisaid outer duct b'eing adj 'ustable forrvariable zloca'lz control-1ofiairiidefiectedc there;-

to passzthrough saidrfurther :panel'.

8 man air: :distributionrsystem, as single source:

'1 the discharga of said single-air source; said 'unit' including a side 'wallastructure-iandr a perforated panel extending transversely of said wall structure and adapted to be disposed adjacent a space to be supplied with air, a further perforated, transversely extending panel in said unit dividing the same into parallel, elongated, outer and inner ducts which communicate with one another through said last named panel, said ducts opening forwardly to said common intake duct portion and said inner duct being adapted to communicate through said first named panel with said space to be supplied, and baflle means disposed in said respective ducts in transversely extending relation to said respective panels to direct air traversing the ducts toward said respective panels, the bafile means in said outer duct being arranged adjacent and in downwardly depending relation to the upper surface of the latter.

9. In an air distribution system, a single source of air, an elongated dual duct unit having a common forward intake duct portion connected to the discharge of said single air source, said unit including a side wall structure and a perforated panel extending transversely of said Wall structure and adapted to be disposed adjacent a space to be supplied With air, a further perforated, transversely extending panel in said unit dividing the same into parallel, elongated, outer and inner ducts which communicate with one anotherthrough said last named panel, said ducts opening forwardly to said common intake duct portion and said inner duct being adapted to communicate through said first named panel with said space to be supplied, and baffle means disposed in said respective ducts in transversely extending relation to said respective panels to direct air traversing the ducts toward said respective panels, the bafiie means in said outer duct being arranged adjacent and in downwardly depending relation to the upper surface of the latter and being adjustable for variable local control of air impinging the same and deflected thereby through said further panel.

10. An air circulatory system comprising a common source to create a longitudinal flow of air, a common intake member connected to the discharge of said common flow creating source, a pair of straight elongated ducts arranged in ad jacent, parallel relation to one another, and in longitudinal alignment with said common source and intake member, to extend along a space to which air is to be distributed, both ducts opening at their forward ends to and being supplied with air by said common intake means, one of said ducts comprising a transversely disposed, airpervious element paralleling and communicating the same with the other duct, said other duct comprising a transversely disposed, air-pervious panel paralleling and communicating the same with said space, baiiie means in said first named duct acting to deflect air longitudinally traversing the same in a transverse direction toward and through said air-pervious element, whereby to agitate the air flowing in said other duct, said agitated air issuing from said other duct through said air-pervious panel to said space, and further bafiie means in said other duct acting to equalize the distribution of air so issuing to said space.

11. An air circulatory system comprising a common source to a create a longitudinal flow of air, a common intake member connected to the discharge of said common flow creating source, a pair of straight elongated ducts arranged in adjacent parallel relation to one another, and in longitudinal alignment with said common source and intake member, to extend along a space to which air is to be distributed, both ducts opening at their forward ends to and being supplied with air by said common intake means, one of said ducts comprising a transversely disposed, airpervious element paralleling and communicating the same with the other duct, said other duct comprising a transversely disposed, air-pervious panel paralleling and communicating the same with said space, a proportioning device to control the ratio of air volumes traversing said respective ducts, baflie means in said first named duct acting to deflect air longitudinally traversing the same in a transverse direction toward and through said air-pervious element, thereby to agitatethe air flowing in said other duct, said agitated air issuing from said other duct through said air-pervious panel to said space, and further bafile means in said other duct acting to equalize the distribution of air so issuing to said space.

NEVILLE R. EMERY. PRESTON O. ROBARDS.

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